Mascara brush



FIG. 1 is a perspective view of a mascara brush, showing our new design;

FIG. 2 is a lateral view (left side) thereof;

FIG. 3 is a lateral view (right side) thereof

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a mascara brush, as shown and described. 